martens



(No Model.)

v W. G. MARTENS.

MACHINE FOR FORMING RINGS, &c.

No. 892,854. Patented Nov. 6, 1888.

UNITED STATES PATENT Farce.

WILLIAM G. MARTENS, on ROCHESTER, NEW YORK.

MACHINE FOR F ORMlNG RINGS, 800.

= SPECIFICATION forming part of Letters Patent No. 392,354, dated November 6, 1888.

(X0 model.)

To aZZ whom it may concern.-

Be it known that I, WILLIAM G. MARrENs, of the city of Rochester, in the county of Monroe and State of New York, have invented a certain new and useful Improvement in Machines for Forming Rings or Ferrules; and

I do hereby declare that the following is a full,

clear, and exact description of the same, ref-' erence being had to the drawings accompanying this specification.

My improvement relates to a machine for bending strips of metal in circular or ring form, and is particularly adapted to making finger-rings. V

The invention consists in the following construction and arrangement.

In the drawings, Figure l is a plan view of the machine with parts broken away to show the rollers beneath. Fig. 2 is a side elevation. Fig. 3 is a cross-section in line 00 x of Figs. 1 and 2. Fig. 4 is an end elevation of a porti on of the machine, showing the gearing.

A indicates the frame, consisting of two standards united by the rods B B, said tierods in Fig. 1 being broken away at the top to show the rollers beneath.

G G are two bed-rollers arranged side by side in a horizontal position, and D is a bending-roller located centrally above them and covering the joint between them. The bending-roller is a plain cylinder in form; but the bed-rollers have in addition to the cylindrical surfaccsa'a one or more grooves, b b, as shown.

in Figs. 1 and 2. These grooves are of dif- "ferent sizes to form rings of different widths of band, and they are made of circular, square, or other form, in cross-section, according to the shape to be given to the outside of the ring. The journals of the bending-roller D rest in boxes 0 c, that slide up and down in ways (1 cl of the frame, and the vertical adjustment is produced by'means of adj usting-screws f f at opposite ends of the machine, which screw into the boxes, or by any other suitable means. By this arrangement the roller can be set high or low, as may be desired. In addition to this, the shaft D rests loosely in the boxes, and being of the same size the whole length it can be drawn out endwise free of the boxes, as indicated by the dotted lines in Figs.

1 and 2. The rollers are connected by any suitable gearing, so as to give motion to all in the same direction, and this gearing may be either on one or both sides of the machine; or the bending-roller may be run independently by a crank and have no gearing connected with it.

h is a crank connected with one of the bedrollers for imparting motion to the same.

In operation a straight strip of metal is placed in the groove of the two bed-rollers, lying crosswise of the same and beneath the plain bending-roller. The rollers are then turned forward and back'alternately, when, by reason of the fitting of the bending-roller down between the joint of the bed-rollers, the strip is caused to bend up in a circle as it is rolled, as indicated by the dotted lines, Fig. 3. The size of the circle will be gaged by the closeness with which the bending-roller sets down into the joint between the bed-rollers. By raising or lowering the bending-roller, as before described, the size of the ring can be made larger or smaller, as desired. The grooves in the bed-rollers will form the back or outside of the ring of any desired form in cross-section-circular, square, or otherwise. In addition to this the grooves keep the strip straight as it is rolled, so that there will be no twist to the ring, but the ends will be brought in alignment when brought into a circle. The end movement of the bendingroller allows it to be drawn out, so that the ring can be removed after it has been bent up. To finish the ring, it only has to be brazed at the ends.

Having described my invention, I do not claim, simply and broadly, bending a ring by passing a straight strip between bending-rollers. Neither do I claim, broadly, grooved rollers; but

What I claim as new, and desire to secure by Letters Patent, is-

1. In a machine for bending rings, the combination oftwo bed-rollers lying side by side and provided with one or more circumferential grooves and a plain bendingroller resting centrally over the bed-rollers and in close proximity thereto, as shown and described, and for'thc purpose specified.

2. In a machine for bending rings, the com- In witness whereof I have hereunto signed bination of the two bed-rollers O O, lying side my name in the presence of two subscribing by side and provided with the circumferential Witnesses. grooves 12, the plain cylindrical bending-roller 5 D, located centrally above the bed-rollers and I \V. G. MAR-TENS.

in near proximity thereto, the boxes 0 c, in which the bending-roller rests, so as to be re- Witnesses: movable endwise, and the thumb-screws f f, P. A. GOSTICH, connected with the boxes for adjusting the R. F. OsGooD.

[0 same vertically,asl1ercin shown and described. 

